aux.“can”的过去式；能够，打算；用于假设语气的条件句；用于虚拟语气的结论句
modal verb能，会，可以（can的过去式）；可能；本来可以；真想
She could see the mountains from her window.
她可以从窗户看到山。
He could play the guitar when he was younger.
他年轻时能够弹吉他。
We could hear the music from across the street.
我们可以从街对面听到音乐。
They could finish the project by next week.
他们能够在下周前完成项目。
She could not find her keys this morning.
她今天早上无法找到钥匙。
If I tried, I could run a marathon.
如果我努力，我可以跑马拉松。
We could visit the museum tomorrow.
我们明天可以去参观博物馆。
He could solve the puzzle quickly.
他能够很快解决这个谜题。
She could speak three languages fluently.
她能够流利地说三种语言。
They could have dinner with us tonight.
他们今晚可以和我们一起吃晚饭。
could have been worse 可能会更糟
could you help me 你能帮我吗
couldn't agree more 完全同意
couldn't care less 毫不在乎
could go either way 可能会有不同结果
could use a hand 需要帮助
